M1008 whining noise

[TedO]

I am noticing a whining noise with a pitch that corresponds to the RPM. Sounds like the noise you hear when it is in 4wd low. I am thinking it might be the steering pump, water pump, or an alternator about to go bad?

 

[cucvrus]

Take the belts off one at a time and see what it is. I highly doubt the water pump. I think power steering.

 

[TedO]

Thanks. If it is the power steering pump, do I need to replace it immediately?

 

[antennaclimber]

It may just be low on fluid.

 

[nyoffroad]

Thanks. If it is the power steering pump, do I need to replace it immediately?

If it needs replacing then do it! Do not wait, these trucks don't steer worth a darn without the power nor do they have much braking ability without the PS pump.

 

[ehuppert]

Have had some "limited" success in the past with changing out many years old fluid! Turkey baster or suction out old fluid, put in new. Problem with systems that don't leak is fluid never gets replenished! May not help, but for the cost involved it's worth a try! Also have seen return lines suck air and aerate the fluid! See if fluid in reservoir looks frothy! If system works but has a little noise I'd personally leave it alone if local use. Have had problems with aftermarket pumps in the past.....

 

[TedO]

Take the belts off one at a time and see what it is. I highly doubt the water pump. I think power steering.

You are correct, as always. And what I thought was a fuel injector pipe leaking diesel was actually......power steering fluid that was sprayed out from a high pressure PS line that separated at the crimp.

 

[MarcusOReallyus]

The right tool is your friend.

Mechanic's stethoscope. You will be amazed at what it will tell you.